This is one of the most important diagnostic gauges for your 914. Especially for 914 2.0 fuel injected models, owners of which are lucky enough to have factory original adjustable fuel pressure regulators. Now you can see the benefit of your tuning efforts. Easily splices into the existing rubber fuel lines. The ends of the adapter are a little larger than stock to ensure a snug fit. Tapered adapter prongs can be slightly filed away to simplify your installation. We recommend lubricating the adapter ends for an easy insertion. The fuel pressure gauge installs right into the adapter. Use teflon tape for the gauge threads. Set includes 0-100 gauge (picture shows 0-15 which is incorrect), adapter, and two hose clamps.